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LM3555 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3555 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 2 page  January 15, 2009 LM3555 PRODUCT BRIEF Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface General Description The LM3555 is a 2 MHz fixed frequency, current mode syn- chronous boost converter designed to drive either a single flash LED at 500 mA or two series flash LEDs at 400 mA. A high-voltage current source allows the LEDs to be terminated to the GND plane eliminating the need for an additional return trace back to the IC. A dual mode control interface allows the user to configure the LM3555 with a general purpose interface using two enable pins for control or an I2C allowing a higher level of control. Both interfaces allow access to the indicator, assist light and flash modes. A dedicated Strobe pin provides a direct inter- face to trigger the flash event, while an external Torch pin provides an additional method for enabling the LEDs in a constant current mode. The LM3555 can adaptively scale the maximum flash level delivered to the LED/LEDs based upon the flash configura- tion, whether it be a single LED or two LEDs in series. Eight protection features are available on the LM3555 ranging from over-voltage protection, to broken inductor detection. The LM3555 has four selectable inductor current limits to help the user select an inductor that is appropriate for the design. Features ■ High Voltage High-Side Current Source Allows for Grounded Cathode LED Operation ■ Synchronous Boost Converter ■ Peak Converter Efficiency >90% ■ Accurate and Programmable LED Current ranging from 60mA to 500mA ■ Adaptive LED Current Range Based on LED Configuration ■ Dedicated Indicator Current Source ■ Dedicated Torch and Strobe Pins ■ Dual Mode Control (General Purpose or I2C) ■ Broken Inductor Detection ■ Output Over-Voltage Protection ■ Output and LED Short-Circuit Protection ■ 400kHz I2C Compatible Interface ■ 12–Bump, 1.575 mm x 2.1 mm x 0.6 mm micro SMD Package (TLA12BCA) Applications ■ Camera Phone LED Flash Typical Application Circuits 30079401 © 2009 National Semiconductor Corporation 300794 www.national.com |
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